Your 1st guess is right on it now find out why most of the time it is electrical check the rear start switches for the right position and go from there to the skinner for a hot and ground sounds simple huh

Well it had to be the valve because I've never had an issue starting and the valve didn't "look" correct. So what caused or causes the schrader valve to be stuck? In the picture is it "open" or "closed"?

Bob is that anything like Panther Piss. Thank You for making my day by remembering Dad. On the farm that was the product he ask for when a bolt was stuck. I think of Dad most days and I am sure I have not lately and that was a reminder.

I had a similar problem recently. Do like Cliff says. Even one better, just take the whole valve off as you'll need to clean it anyways. Once it's off try starting it up. If it starts right up you'll know that's the problem. Just make sure you have a way to hit that kill switch with the valve off or a way to cut off the air to the engine or else you'll have to wait until she runs outta fuel

I keep a 14-inch stick handy to reach between the miter box belt to close the shut-down valve. I keep it on the interior ledge of one side of the back doors. Sometimes you just have to kill the engine before sufficient air has built to actuate the shut down piston. Incidentally, there are several reasons not to reach in there with your finger. If you'd like to replace the electric-over-air piston, I got one a few years back from Mohawk in Illinois - not too terribly expensive.https://www.mohawkmfg.com/ Just FWIWMike in GA

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Past President, Southeast Bus Nuts. Busin' for more than 14 years in a 1985 MC 96a3 with DD 8v92 and a 5 speed Allison c/r.